Exhaust silencer



June 20, 1933. I E ROGNON 1,914,789

EXHAUST SILENCER Filed Oct. 28, 1929 5 Sheets-Sheet l .lvnnuztor Ernesc 72: 71070 ic ys.

June 20, 1933. E.- ROG NON 1,914,789

EXHAUST S ILENCER Filed Oct. 28, 1929 5 Sheets-Sheet 2 Fig.2

Fig la I mfiszgzzit June 20, 1933. E. ROGNCN EXHAUST SILENCER Filed Oct. 28. 1929 5 Sheets-Sheet 3 m m" I m. w QM M .5 w

June 20, 1933. E. ROGNON EXHAUST SILENCER Filed Oct. 28. 1929 5 Sheets-Sheet 4 m mm M; VM a w M W Z June 20, 1933. E. ROGNON v1,914,789

EXHAUST SILENGER Filed Oct. 28, 1929 5 Sheets-Sheet 5 Fig.1

Even. to r," Ernest Fey 07 Patented June 20, I933 UNITED STATES BOGNON, F PARIS, FRANCE EXHAUST SILENCER Application filed October 28, 1929, Serial No The present invention has for its subject an exhaust silencer having .the following features:

1. The gases from the exhaust of the engine always pass through a passage 1n the apparatus and which extends along the whole length of the latter, having a cross sectional area which is at least equal to the cross sectional area of the exhaust pipe of the engine.

2. The silencer is formed by a casing of circular section or any suitable polygonal section, the said casing being provided with an expansion chamber and piles of plates of a particular shape.

3. The plates referred to in paragraph 2 are made of sheets of any suitable metal, are

- of a section identical with that of the casing in which they are located andare provided with apertures inclined relatively to a plane at right angles to the longitudinal axis of the apparatus, any suitable number of these apertures being provided, these apertures forming a passage for the exhaust gases from the engine.

it. The inclined apertures referred to in paragraph 3 may be placed either at the centre of each of the plates or arranged in a circle on the said plates. In the first case they are formed by two combined elements projecting from each of the faces and forming a single passage for the gases. In the second case they are formed by any suitable number of elementary apertures each of which is formed as in the first case by two combined elements projecting from'opposite faces of the plate.

5. The piles of plates may be held in the interior of the casing by any suitable means and means are provided for facilitating the cooling of the apparatus, these means preferably consisting either of blades secured to the casing outside the expansion chamber, or of an air jacket surrounding the apparatus along the whole or a portion of its length.

In the accompanying drawings Figure 1 is a sectional view along the longitudinal axis of an exhaust silencer constructed in accord ance with the invention and 0 showing the intake endthcreof.

. 403,059, and in France September 8, 1929.

Figure 1a is a sectional view of the discharge end of the silencer represented in 'Figure 1.

Figure 2 is an end view of the same apparatus seen from the inlet side for the gases.

Figures 3, 4, 5 and 6 show respectively in elevation, side view, plan and perspective view the manner of constructing the plates.

Figures 7 and 8 show an elevation and outline of a plate provided with four apertures arranged in a circle.

Figure 9 shows the manner in which the gases circulate through the apparatus constructed in accordance with the invention.

Figures 10 and 11 show respectively a 1011- gitudinal axial section of the apparatus and an end view of the exhaust silencer constructed in accordance with the invention and provided with a cooling air jacket.

As will be seen in Figures 1 and 2 an exhaust silencer constructed in accordance with the invention may be composed of a tubular casing 1 closed on the englne side by acover ,2 and at the opposite end by a second cover 3, these two covers being preferably connected together and tightened against the casing b means of rods 4 screw threaded at their en s and bearing against the covers by nuts 5.

In the interior ofthe casing 1 and at the end adjacent the engine there is provided an 30 expansion chamber 6 whilst adjacent the gas outlet there is provided a pile of plates 7 of wflich the arrangement is described herein a er.

The lates7 (Figures 3, 4, 5, 6,7 and 8) are fol-me by metal plates of which the external section is identical with that of the casing and which are preferably provided at their peripherywith a bent rim 8 having two different dlameters in such'a manner that one of the plates can be fitted into the receding one or into the following one andby, reason of this interengage'ment is held at a suitable distance from theadjacent plate or plates.

Each of the plates is provided with at-least one aperture formed by two projecting por-' tions 9 and 9 arranged in opposite directions and extending from opposite faces of the} plate in such a manner that they form for the gases a passage 10 which is slightly inclined to the longitudinal axis of the apparatus. v

The section of this passage may vary. according to the shape and dimensions of the projecting portions but it should at least be equal to the cross sectional area of the exhaust pipe from the engine. v

Referring to Figure 1 it will be seen that the exhaust gases reach the first plate in the direction of the arrow f and pass into the first passage 10 formed by the two projecting portions of this plate. The plates 7 being piled with a suitable distance between them the gases, when reaching the passage 10, meet the surface of the projecting portion 9 of the second plate. They are consequently divided into two streams c, c (Figure 9) of which one is directed between the first and second plates whilst the second stream passes between the second and third plates. The first stream can only escape by passing around the interior of the casing between the two plates either in onedirection or the other until it passes through a passage 10. As regards the second stream, this follows a similar path between the second and third plates so as to escape through the passage 10" of the third plate.

It will be seen that in this manner the gases can only circulate in the apparatus by following a very long path between the plates, but it will also be seen that the cross sectional area of the passage which is provided for them is always at least equal to the cross sectional area of the exhaust pipe of the engine.

Consequently no counter-pressure is set up in the exhaust silencer so that the gases can escape. freely whilst by reason of the provision of the plates the apparatus silences the exhaust.

Figures 7 and 8 show another form of construction of the plates in which form of construction the apertures, instead of being solely provided at the central portion of the plate, are arranged in a circle around the centre of the plate, eachof them being formed in the same manner as those formed by'the projecting portions 9 and 9' shown in Figures 3, 4 and 5. 4

It will be understood that in this case and for the same dimension of the plates the apertures are each of a cross sectional area which is smaller than the single aperture previously described but in this manner apassage of larger total cross sectional area is obtained. It will be understood that any suitable number of apertures may be arranged in a circle.

It may be mentioned that thisarrangement of the apertures in a circle promotes the gyratory movement of the gases between the platesin the interior of the casing.

The projecting portionsforming the apertures may be fitted over the openings of the plates and secured to the said plates in any suitable manner (rivetting, welding etc.) but preferably they are stamped in the plates themselves whilst the rim'of two diameters referred to above is preferably'formed in the same manner.

The casing 1, the covers 2 and 3, as also the piles of plates 7, n1ay be held in position by nuts 5 screwed upon the ends of screw threaded rods 4 and bearing against the covers 2 and 3. This method of assemblage is only illustrated by way of example and any other preferred method of amemblage ma be used.

n order toefi'ect the cooling of the apparatus the casing may be provided with radial fins or blades 11 which may extend along the whole length of the. apparatus but which may also, as shown in Figures 1 and 2, be solely disposed around the expansion chamber 6.

The cooling device may also be formed in the manner shown in Figure 10, in which form of construction the casing 1 is limited in length so as to form solely the expansion chamber on which are arranged the piles of plates which themselves form a closed receptacle and are assembled with the casing 1 by the rods 4 as above described.

Around the body of the apparatus formed in this manner there is provided a jacket 12 held at asuitable distance from the body of the apparatus by any suitable means in such a manner that an annular space remains between the body and the jacket through which air may circulate in the direction of the arrows 9 andescape in the direction of the arrows 70., This stream of air whilst at the same time cooling the apparatus exerts a suction action on the outlet of the gases, thus facilitating the flow of these.

It will be understood that the methods of construction of the invention above described and illustrated in the accompanying drawings are only given by way of example and that, in particular, the piles of plates may be composed of any suitable number of plates either of the same nature or of a. difl'erent character, the passage openings may be of any suitable shape, whilst the plates may be made of an' suitable metal, the cooling may be effected any suitable preferred system whilst the' general arrangement for assembling the apparatus me. be varied, these modifications or the selection of the means not departing from the scope of the invention.

The apparatus may be mounted on the exhaust pipe of explosion or internal combustion engines of all types as also on ventilators and compressors and in general on all apparatus where it is desired to deaden the sound due to the exhaust ofgases.

I claim 1. A mufller for use with. an engine having an exhaust manifold, comprising a casing communicating with the exhaust manifold, an expansion chamber, and a plurality of impact walls disposed at the interior of said casing and provided with oblique openings,

two pockets forming each of said openings, each pocket being opposed to and opening on the opposite side of the impact wall from the other.

2. Mufiier as claimed in claim 1 in which the oblique openings are provided at the centor of each impact wall.

ERNEST ROGNON. 

